One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,7)(5,6)(10,14)(11,16)(19,23)(22,24)(26,28)(27,31) involution — undirected(1,3,6,4)(2,7,5,8)(9,10)(11,12)(13,14)(15,16)(27,31)(30,32)(2,5)(7,8)(10,14)(12,15)(17,18,21,20)(19,22,23,24)(25,26,29,28)(27,30,31,32)(1,4,6,3)(2,7,5,8)(9,11,13,16)(10,15,14,12)(17,19,21,23)(18,22,20,24)(25,27,29,31)(26,30,28,32)(1,5,6,2)(3,8,4,7)(9,12,13,15)(10,11,14,16)(17,20,21,18)(19,24,23,22)(25,28,29,26)(27,32,31,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.